<template>
  <div class="list" ref="wrapper">
    <div class="content">
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item of hotCities"
               :key="item.id"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(item,key) of cities"
           :key="key"
           :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list"
             v-for="innerItem of item"
             :key="innerItem.id"
             @click="handleCityClick(innerItem.name)"
        >
          <div class="item border-bottom">{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  data () {
    return {
    }
  },
  methods: {
    handleCityClick (city) {
      // dispatch派发一个名字为changeCity的action,配合vuex中的actions
      // this.$store.commit('changeCity', city)
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import "~styles/varibles.styl"
  .border-topbottom{
    &:before{
      border-color $borderColor
    }
    &:after {
      border-color $borderColor
    }
  }
  .border-bottom{
    &:before{
      border-color $borderColor
    }
  }
  .list{
    position absolute
    overflow hidden
    top 1.58rem
    left 0
    bottom 0
    right 0
    .title{
      line-height .54rem
      background #eee
      padding-left .2rem
      color #666
      font-size .26rem
    }
    .button-list{
      padding .1rem .6rem .1rem .1rem
      overflow hidden
      .button-wrapper{
        float left
        width 33.33%
        .button{
          text-align center
          margin .1rem
          padding .1rem 0
          border .02rem solid $borderColor
          border-radius .06rem
        }
      }
    }
    .item-list{
      .item{
        line-height .76rem
        padding-left .2rem
      }
    }
  }
</style>
